Coater drying oven structure

Abstract

The invention provides a coater drying oven structure which is formed by horizontally connecting three separate drying ovens, wherein conveying rollers are arranged in each separate drying oven; the conveying rollers in the first separate drying oven are arranged along the same horizontal plane; the conveying rollers in the second separate drying oven are arranged along the same horizontal plane; the level of the conveying rollers in the second separate drying oven is higher than that of the conveying rollers in the first separate drying oven; and the vertical distances between the conveying rollers in the third separate drying oven and the bottom surface of the third separate drying oven are different so that a diaphragm to be coated winds through the conveying rollers in the third separate drying oven. The coater drying oven structure effectively solves the problem about horizontal drying during double-side simultaneous coating through a unique coating roller position design, satisfy the compatibility of single-side coating and double-side coating, can obviously save the investment of fixed equipment, has outstanding social benefits, and meets the demand of large-scale industrial production.

Description

technical field [0001] The invention relates to the field of manufacturing battery separators, in particular to a coater oven structure. Background technique [0002] The coating modification of lithium-ion battery diaphragm is a hot spot and a difficult point in the lithium battery industry at present. The hot point is that the heat resistance and mechanical strength of the lithium battery diaphragm itself are poor, which can no longer meet the needs of high specific energy density and large capacity battery systems. Therefore, improving its thermal and mechanical properties by coating modification has become an important direction for the development of diaphragm materials at home and abroad. The difficulty lies in: first, the thickness of the diaphragm is very thin, and the current main models used are generally within 20 microns, and the current mainstream diaphragm coating substrate has dropped to about 12 microns; second, because the diaphragm material is made by stret...

AI Technical Summary

Problems solved by technology

[0002] The coating modification of lithium-ion battery diaphragm is a hot spot and a difficult point in the lithium battery industry at present. The hot point is that the heat resistance and mechanical strength of the lithium battery diaphragm itself are poor, which can no longer meet the needs of high specific energy density and large capacity battery systems. Therefore, improving its thermal and mechanical properties by coating modification has become an important direction for the development of diaphragm materials at home and abroad.

The difficulty lies in: first, the thickness of the diaphragm is very thin, and the current main models used are generally within 20 microns, and the current mainstream diaphragm coating substrate has dropped to about 12 microns; second, because the diaphragm material is made by stretching process, There is bound to be a problem of transverse arching, and the consistency of the diaphragm substrate used for coating is difficult to ensure

Third, due to the high porosity of the diaphragm, which is generally above 38%, and the large-porosity diaphragm is even above 50%, the mechanical strength of the diaphragm coil is poor, which is manifested in the tensile strength and surface smoothness of the diaphragm. Compared with the same material Ordinary film is much different

Therefore, it is difficult to carry out modification on the surface of the diaphragm on an ordinary film coating machine.

[0003] The coating method of the existing coating machine oven structure is single, and the single-sided coating equipment and double-sided simultaneous coating equipment are very different, and basically do not have the feasibility of compatibility

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